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Network Working Group Request for Comments:

876

D. Smallberg ISI September 1983

Survey of SMTP Implementations ---------------------This memo is a survey of implementation status. It does not specify an official protocol, but rather notes the status of impementation of aspects of a protocol. It is expected that the status of the hosts reported on will change. This information must be treated as a snapshot of the state of these implementations. ---------------------From May to August 1983, I tested SMTP servers on the Internet to see whether they accepted connections from the Arpanet (a Class A network) and ISI-Net (a Class B network), whether they accepted the user "postmaster" as a mail recipient, and whether a nonexistent user was immediately rejected as a mail recipient. The hosts from which the tests were conducted were ISI-VAXA on the Arpanet (running 4.1bsd UNIX), and ISI-MOE on ISI-Net (running 4.1a). Internet hosts were tested at various times throughout the last four months. During the survey, I noted anomalies in a few dozen hosts' SMTP servers; examples included a RSET command causing the server to close the connection, a VRFY POSTMASTER evoking a reply containing an illegal mailbox, and some cases of improper reply codes. These bugs were reported and in most cases promptly fixed. I would class three problems as significant because about 40 hosts exhibit at least one of them: 1) In reply to a RSET and/or a NOOP command, some servers reply "200", which is never a legal reply code, instead of "250". (See sections 4.2 and 4.3 of RFC 821.) If a VRFY command occurs before a MAIL command, some hosts reply "554 Nested MAIL command". The end of section 4.1.1 of RFC 821 states that a VRFY may occur anywhere in the session. If a mail transaction is started, with a sender and receiver specified, and a RSET is issued before the text of the message itself is collected, some servers send a message to the sender about being unable to deliver mail because no message was collected. While RFC 821 doesn't rule this out, it certainly is not consistent with the notion of resetting the transaction.

2)

3)

In the table in the appendix, the names and addresses of the hosts tested were taken from the NIC host table of 17 August 1983. TACs and echo hosts were not included in the survey.

Page 1


RFC 876 Here are the summarized results of the survey: 483 hosts were tested 283 are claimed by the host table to support SMTP 49 of those 283 (17%) failed to permit a connection to be opened from either ISI-VAXA or ISI-MOE. 51 hosts did not claim to support SMTP, but did allow a connection to be opened from at least one of the two ISI test hosts. 285 hosts were connected to from ISI-VAXA 170 hosts were connected to from ISI-MOE; all 170 were connected to from ISI-VAXA as well. 115 hosts out of the 285 (40%), therefore, could be connected to from ISI-VAXA only. 69 of the 285 connectable hosts (24%) returned a positive reply to the command "VRFY postmaster" 162 hosts out of the 285 connectable hosts (57%) immediately rejected mail addressed to a nonexistent user; that is, they gave an "unknown user" reply to the command "RCPT TO:", where "host" was the foreign host. 115 hosts out of the 285 (40%) gave a positive acknowledgement to a RCPT command with a nonexistent user. 8 hosts (3%) were never up during this part of the test. 121 hosts out of the 162 which immediately reject mail to nonexistent users (75%) accepted mail for the recipient "postmaster". Thus, 42% (121 out of 285) of the connectable hosts do not immediately reject mail for "postmaster".

References: RFC 821 Postel, J., "Simple Mail Transfer Protocol", RFC 821, Network Information Center, SRI International, Menlo Park, August 1982.

Page 2


RFC 876 APPENDIX

The hosts in this table are taken from the NIC host table of 17 August 1983, with TACs and echo hosts omitted, and are grouped by network. There are six result entries for each host: Claim SMTP + = the host table lists this host as supporting SMTP; - = such support is not listed + = a connection could be opened from ISI-VAXA - = no such connection could be opened + = a connection could be opened from ISI-MOE - = no such connection could be opened + = the command "VRFY postmaster" evoked a positive reply - = it did not + = the command "RCPT TO:" elicited a positive reply - = it did not + = the command "RCPT TO:" elicited a negative reply (i.e. unknown user) - = it received a positive reply (i.e. recipient accepted)

Arpanet

ISI-Net

VRFY Post

RCPT Post

Bad jqkx

Claim Arpa ISI- VRFY RCPT Bad SMTP net Net Post Post jqkx Host name ----- ---- ---- ---- ---- ---- --------alta-coma satnet etam-expak goonhilly-expak tanum-expak satnet-sink etam-monitor goonhilly-monitor tanum-monitor raisting raisting-monitor raisting-expak fucino fucino-monitor fucino-expak + + + + + bbncca + + + + + bbnccb + + + + + bbnccc + + + + + bbnccd + + + bbnccg + + + + + bbnccf

Address ------3.1.0.50 4.0.0.0 4.0.0.1 4.0.0.2 4.0.0.3 4.0.0.37 4.0.0.41 4.0.0.42 4.0.0.43 4.0.0.72 4.0.0.78 4.0.0.79 4.0.0.88 4.0.0.94 4.0.0.95 8.0.0.2 8.1.0.2 8.2.0.2 8.3.0.2 8.0.0.3 8.0.0.4

Notes -----

b

Page 3


RFC 876 Claim Arpa ISI- VRFY RCPT Bad SMTP net Net Post Post jqkx Host name ----- ---- ---- ---- ---- ---- --------+ + + + + bbnccp + + + + + bbncci + + + + + bbnh + bbn-cdnoc + + + + + bbn-cd + + + + + bbn-admin + + + + + bbn-inoc + + + + + bbnccw + + + + + bbnccs + + + + + bbnz + + + + + bbnccq + + + + + bbnccx + + + + + bbnccy + + + + + csnet-cic + + + + + bbn-noc + + + + ucla-cs ucla-ccn + + + + ucla-locus + + + + ucla-ats sri-nsc11 + + + + + + sri-kl + + + + sri-csl + + + + sri-tsc + + + + nosc-cc logicon + + + + nprdc + + + + + + utah-cs + + + + utah-20 + + + + bbnf + + + + bbng + + + + bbna + + + + + + mit-multics + + + + mit-dms mit-ai-reserved + + + + mit-ml + + + + + rand-relay + + + + + rand-unix + + + + + nrl + + + + nrl-aic + + + + + nswc-wo nrl-tops10 nrl-arctan + + + + nrl-css harv-10 + + + + yale + + + + + ll + + + + ll-vlsi + + + ll-xn + + + ll-en + ll-sst Page 4

Address ------8.2.0.4 8.3.0.4 8.4.0.4 8.0.0.5 8.1.0.5 8.1.0.6 8.2.0.6 8.3.0.6 8.0.0.7 8.1.0.7 8.2.0.7 8.0.0.8 8.2.0.8 8.0.0.14 8.1.0.14 10.0.0.1 10.1.0.1 10.2.0.1 10.3.0.1 10.0.0.2 10.1.0.2 10.2.0.2 10.3.0.2 10.0.0.3 10.2.0.3 10.3.0.3 10.0.0.4 10.3.0.4 10.0.0.5 10.1.0.5 10.3.0.5 10.0.0.6 10.1.0.6 10.2.0.6 10.3.0.6 10.1.0.7 10.3.0.7 10.0.0.8 10.1.0.8 10.2.0.8 10.3.0.8 10.6.0.8 10.7.0.8 10.0.0.9 10.2.0.9 10.0.0.10 10.1.0.10 10.2.0.10 10.4.0.10 10.6.0.10

Notes -----


RFC 876 Claim Arpa ISI- VRFY RCPT Bad SMTP net Net Post Post jqkx Host name ----- ---- ---- ---- ---- ---- --------+ + + + + su-ai + + + + + + su-score + + + + + compion-vms + + + + + + gunter-adam + + + cmu-cs-b + + + + cmu-cs-a + + + + cmu-cs-c + + + + + rochester + + + + + ames-tss + + + + ames-vmsa + + + ames-vmsb + + + + + mitre + + + mitre-gateway mitre-lan + + + + + + radc-multics + + + + + + radc-tops20 radc-unix + ge-crd + + + + nbs-vms + + + nbs-sdc nbs-unix nbs-pl cctc + + + + + edn-unix + + + dca-ems dcec-psat dcec-itel dcec-bridge + lll-tis + + + + lll-mfe lll-zdivision isi-speech11 + + + + + + usc-isi + + + + + + usc-isic + + + + usc-eclb + + + + usc-eclc + + + + usc-ecl + + + + + nadc wharton-10 + + + + + + seismo + + + + + + usc-isid isi-png11 + + + + isi-vaxa isi-mcon isi-wbc11 isi-maint11 isi-setting isi-loretta isi-pallas-athene isi-aikane Page 5

Address ------10.0.0.11 10.3.0.11 10.0.0.12 10.1.0.13 10.0.0.14 10.1.0.14 10.3.0.14 10.0.0.15 10.0.0.16 10.2.0.16 10.3.0.16 10.0.0.17 10.1.0.17 10.4.0.17 10.0.0.18 10.3.0.18 10.5.0.18 10.6.0.18 10.0.0.19 10.1.0.19 10.2.0.19 10.3.0.19 10.0.0.20 10.3.0.20 10.4.0.20 10.5.0.20 10.6.0.20 10.7.0.20 10.0.0.21 10.1.0.21 10.2.0.21 10.0.0.22 10.1.0.22 10.2.0.22 10.0.0.23 10.1.0.23 10.3.0.23 10.0.0.24 10.3.0.24 10.0.0.25 10.0.0.27 10.1.0.27 10.2.0.27 10.1.21.27 10.1.23.27 10.1.25.27 10.1.89.27 10.1.90.27 10.1.91.27 10.1.97.27

Notes -----


RFC 876 Claim Arpa ISI- VRFY RCPT Bad SMTP net Net Post Post jqkx Host name ----- ---- ---- ---- ---- ---- --------isi-czar isi-mycroftxxx isi-cmr isi-ihm + + arpa-dms + arpa-png11 + + + + + brl + + + + apg-1 + + + cca-unix + + + + cca-vms + + + + parc-maxc + + + kestrel nps fnoc-secure + + + + lbl-nmm + + + + + lbl-csam nosc-secure2 + + + nosc-tecr nosc-secure3 nosc-f4 coins-tas cincpacflt-wm + + + + purdue + bragg-sta1 bbn-psat-ig + + + + + office-1 + + + + + office-2 + + + + office-3 + + + + office-7 + + + + mit-xx mit-tstgw + + + + mit-mc + + + + ardc collins-pr collins-gw okc-unix wpafb + wpafb-afwal afwl + + + + bbnb + + + + bbnc + + + + + bbn-clxx + + + + + + st-nic sri-sta6 + + + + + srijoyce + + + + sri-unix sri-sta2 sri-prmh + + + + + ada-vax + + + + + + usc-isie Page 6

Address ------10.1.98.27 10.1.99.27 10.1.124.27 10.1.125.27 10.0.0.28 10.3.0.28 10.0.0.29 10.1.0.29 10.0.0.31 10.1.0.31 10.0.0.32 10.3.0.32 10.0.0.33 10.3.0.33 10.0.0.34 10.1.0.34 10.0.0.35 10.1.0.35 10.3.0.35 10.4.0.35 10.0.0.36 10.1.0.36 10.0.0.37 10.1.0.38 10.2.0.40 10.0.0.43 10.1.0.43 10.2.0.43 10.3.0.43 10.0.0.44 10.2.0.44 10.3.0.44 10.1.0.45 10.0.0.46 10.1.0.46 10.3.0.46 10.0.0.47 10.1.0.47 10.1.0.48 10.0.0.49 10.3.0.49 10.4.0.49 10.0.0.51 10.1.1.51 10.1.4.51 10.2.0.51 10.3.1.51 10.3.2.51 10.0.0.52 10.1.0.52

Notes -----


RFC 876 Claim Arpa ISI- VRFY RCPT Bad SMTP net Net Post Post jqkx Host name ----- ---- ---- ---- ---- ---- --------+ + + + + + usc-isif + + + + + + usc-isib afsc-ad afsc-dev ncsc martin + + + + + + cit-20 + + + + cit-vax + + acc + + + + jpl-vax + + + anl-mcs + + + + + + sumex-aim + + + + + su-dsn + + + + + aids-unix tycho coins-gateway + + + + nyu + + + + + bnl + + + + + + rutgers + + + + + ru-green + + + + + ru-blue + + + + + + stl-host1 + almsa-1 + + + + + utexas-11 + + + + + + utexas-20 + + + + utexas-780 + + + martin-b robins-unix afsc-sd + + + + aerospace afgl + + + + mitre-bedford + + + + + afsc-hq + + + + + + usgs1-multics usgs1-amdahl + + + + + + usgs2-multics + + + + usgs3-multics + usgs3-vms bbn-tmp2 + + + + + bbn-unix + + + + sri-nic sri-warf + + + + + + sri-ai + + + sri-iu + + sri-vax + sri-spam-test + simtel20 + + + + wsmr70a + + + + wsmr70b + + + yuma Page 7

Address ------10.2.0.52 10.3.0.52 10.0.0.53 10.2.0.53 10.4.0.53 10.5.0.53 10.0.0.54 10.1.0.54 10.2.0.54 10.3.0.54 10.1.0.55 10.0.0.56 10.1.0.56 10.2.0.56 10.0.0.57 10.1.0.57 10.0.0.58 10.1.0.58 10.2.0.58 10.2.1.58 10.2.2.58 10.0.0.61 10.1.0.61 10.0.0.62 10.1.0.62 10.2.0.62 10.1.0.64 10.3.0.64 10.0.0.65 10.2.0.65 10.1.0.66 10.3.0.66 10.0.0.67 10.0.0.68 10.2.0.68 10.0.0.69 10.0.0.70 10.2.0.70 10.2.0.71 10.1.0.72 10.0.0.73 10.1.0.73 10.2.0.73 10.3.0.73 10.3.2.73 10.4.0.73 10.0.0.74 10.1.0.74 10.3.0.74 10.3.0.75

Notes -----

a

b


RFC 876 Claim Arpa ISI- VRFY RCPT Bad SMTP net Net Post Post jqkx Host name ----- ---- ---- ---- ---- ---- --------+ obl-em + + + + + + cisl-service-multics + mit-oz + + + + + + ucb-arpa + + + + + + ucb-vax mcclellan + + + + + + dec-tops20 + + + + + + dec-marlboro + + + + + + hi-multics + + + + + nems + + + + + nalcon + + + + + nsrdcoa + + + + + bbncct + + + + + + bbn-vax + + + + + ddn1 bbn-rsm + + + + + bbn-noc2 test-mailbr + + + + minet-lon + + + minet-noc + + + tac-news test-bridge nswc-dl + + nswc-g + + + nwc-387a + + + + + nwc-387b + + + + + stt-noc + + + + + + sandia + + + + + + nlm-mcs + + + + + + columbia-20 + + + + lanl + + + + + + washington + + + + uw-vlsi nusc-npt + + nusc + + + + office-8 + + + + + office-10 + + + + + office-15 + + + + uwisc s1-gateway + + + + s1-a + s1-b + + + + s1-c + + + + + udel-relay udel-tcp + + + + udel-ee + + + + + cornell + + + + paxrv-nes uwisc-x25 + purdue-tn Page 8

Address ------10.0.0.76 10.1.0.77 10.3.0.77 10.0.0.78 10.2.0.78 10.3.0.78 10.0.0.79 10.1.0.79 10.0.0.80 10.0.0.81 10.1.0.81 10.3.0.81 10.0.0.82 10.1.0.82 10.3.0.82 10.4.0.82 10.6.0.82 10.7.0.82 10.0.0.83 10.1.0.83 10.2.0.83 10.3.0.83 10.0.0.84 10.1.0.84 10.0.0.85 10.3.0.85 10.0.0.86 10.0.0.87 10.0.0.88 10.0.0.89 10.0.0.90 10.0.0.91 10.3.0.91 10.2.0.92 10.3.0.92 10.0.0.93 10.1.0.93 10.2.0.93 10.1.0.94 10.0.0.95 10.1.0.95 10.2.0.95 10.3.0.95 10.0.0.96 10.1.0.96 10.2.0.96 10.3.0.96 10.2.0.97 10.3.0.99 14.0.0.1

Notes -----

b b


RFC 876 Claim Arpa ISI- VRFY RCPT Bad SMTP net Net Post Post jqkx Host name ----- ---- ---- ---- ---- ---- --------+ uwisc-tn + udel-tn ucl-vtest uk-satnet wisc-ibm + rand-tn mit-br-ethernet mit-tiu mit-alto-509 mit-alto-510 mit-alto-524 mit-alto-214b mit-alto-511 mit-muriel mit-alto-508 mit-alto-503 mit-spooler mit-np-alto mit-alto-502 mit-alto-828 mit-alto-520 mit-gw-lcs mit-bridge mit-rts mit-rts40 mit-vax mit-xx-11 + + + + mit-csr mit-rts40-v2 + + + mit-ajax + + + mit-borax + + + mit-comet mit-dutch + + + mit-mrclean + + + mit-bold + + + mit-fab + + + mit-prj + + + mit-duz + + + mit-dash + + + mit-tide + + mit-fla + + + + mit-cls + + + mit-grape-nehi + + + mit-heineken + + + mit-oa mit-macewan mit-kirin + + + mit-molson + + + mit-milo + + + + + mit-opus Page 9

Address ------14.0.0.2 14.0.0.3 14.0.0.4 14.0.0.6 14.0.0.7 14.0.0.8 18.2.0.7 18.2.0.15 18.2.0.18 18.2.0.20 18.2.0.32 18.2.0.56 18.2.0.72 18.2.0.80 18.2.0.96 18.2.0.100 18.2.0.128 18.2.0.129 18.2.0.130 18.2.0.134 18.2.0.170 18.8.0.4 18.8.0.5 18.8.0.9 18.8.0.10 18.8.0.16 18.8.0.32 18.10.0.8 18.10.0.10 18.10.0.64 18.10.0.65 18.10.0.66 18.10.0.67 18.10.0.68 18.10.0.69 18.10.0.70 18.10.0.71 18.10.0.72 18.10.0.73 18.10.0.74 18.10.0.75 18.10.0.76 18.10.0.77 18.10.0.78 18.10.0.79 18.10.0.80 18.10.0.81 18.10.0.82 18.10.0.86 18.10.0.87

Notes -----


RFC 876 Claim Arpa ISI- VRFY RCPT Bad SMTP net Net Post Post jqkx Host name ----- ---- ---- ---- ---- ---- --------+ + + mit-rinso rsre + + + + su-shasta + + + + + + su-hnv + + + + + + su-navajo + + + + + + su-whitney + + + + + su-glacier + + + su-star + + + + + su-carmel + + + + + + su-sierra + su-ardvax + su-safe + + + + sri-tsca sri-rolm + + + + ucbarpa + + + + ucbcad + + + ucbernie + + + + ucbmonet + + + ucbesvax + + + + + ucbvax + + + + ucbkim + + + + ucbcalder + + + ucbdali + + + ucbmatisse + + + ucbmedea + + + + ucbingres + + + + + sac-vax + + + ndre1 + + + nta-vax + + + cmu-cs-ius + + + cmu-cs-vlsi cmu-cs-ps1 + + + cmu-cs-zog + + + cmu-cs-g + + + cmu-cs-cad + cmu-cs-k + + + cmu-ri-fas + + + cmu-cs-spice + + + cmu-cs-gandalf + cmu-ri-leg + + + cmu-ri-isl1 cmu-cs-j + + + cmu-cs-speech cmu-cs-ps2 + + + cmu-cs-unh + + + cmu-ri-arm + + + cmu-ri-isl2 + + + cmu-cs-cfs + + + cmu-cs-jk + + + cmu-cs-pt Page 10

Address Notes ----------18.10.0.88 25.8.0.0 36.40.0.192 36.40.0.193 36.40.0.203 36.40.0.204 36.40.0.205 36.40.0.207 36.40.0.212 36.40.0.213 36.45.0.85 36.45.0.86 39.128.3.59 45.0.32.4 46.0.0.4 46.0.0.5 46.0.0.6 46.0.0.7 46.0.0.9 46.0.0.10 46.0.0.11 46.0.0.12 46.0.0.13 46.0.0.14 46.0.0.15 46.0.0.19 47.0.32.3 48.3.1.41 50.0.0.8 128.2.254.128 128.2.254.129 128.2.254.130 128.2.254.131 128.2.254.132 128.2.254.133 128.2.254.136 128.2.254.138 128.2.254.139 128.2.254.140 128.2.254.141 128.2.254.143 128.2.254.144 128.2.254.145 128.2.254.146 128.2.254.150 128.2.254.151 128.2.254.152 128.2.254.153 128.2.254.154 128.2.254.155


RFC 876 Claim Arpa ISI- VRFY RCPT Bad SMTP net Net Post Post jqkx Host name ----- ---- ---- ---- ---- ---- --------+ + + cmu-cs-h + + + cmu-ri-rover + + + dcn1 + dcn2 + + + dcn3 + dcn4 + + + dcn5 + + + dcn6 + + + dcn7 + + + dcn8 + dcn9 + + + ford1 + + + ford2 + + + ford3 + + + ford4 + + + ford-lab + ford-vax + ford-res + + + ford-ecc + + + ford-srl + + + ford-ers + + + ford-eed + + + ford-foe + + + ford-wdl1 + ford-wdl2 + + + ford-wdl3 + ford-wdl4 + + + ford-wdl5 + + ford-wdl6 + dfvlr1 + dfvlr2 + dfvlr3 + dfvlr7 + + + umd1 + + + umd2 + + + umd3 + + + cvl + + + umd5 + umd6 + umd7 + + + umd-csd + umd9 + umda + umdb + umdc + umdd + umde + umdf isi-accutest isi-elvira Page 11

Address Notes ----------128.2.254.156 128.2.254.157 128.4.0.1 128.4.0.2 128.4.0.3 128.4.0.4 128.4.0.5 128.4.0.6 128.4.0.7 128.4.0.8 b 128.4.0.9 128.5.0.1 128.5.0.2 128.5.0.3 128.5.0.4 128.5.0.8 128.5.0.9 128.5.0.10 128.5.0.11 128.5.0.12 128.5.0.13 128.5.0.14 b 128.5.0.15 b 128.5.32.1 128.5.32.2 128.5.32.3 128.5.32.4 128.5.32.5 128.5.32.6 128.7.0.1 128.7.0.2 128.7.0.3 128.7.0.7 128.8.0.1 128.8.0.2 128.8.0.3 128.8.0.4 128.8.0.5 128.8.0.6 128.8.0.7 128.8.0.8 128.8.0.9 128.8.0.10 128.8.0.11 128.8.0.12 128.8.0.13 128.8.0.14 128.8.0.15 128.9.0.24 128.9.0.41


RFC 876 Claim Arpa ISI- VRFY RCPT Bad SMTP net Net Post Post jqkx Host name ----- ---- ---- ---- ---- ---- --------isi-hobgoblin isi-moe isi-troll isi-curly isi-shemp isi-zombie isi-xorn + + isi-vlsia + + + isi-vlsib isi-dawn isi-rising isi-spanky isi-alfalfa isi-darla isi-buckwheat isi-stymie isi-farina isi-pete isi-froggie isi-wab2 isi-randy isi-rag2 + + + csnet-purdue + + + bbn-cvax + + + bbnv1 ucl-lsih ucl-lsil ucl-lsim ucl-lsii ucl-lsij ucl-lsik ucl-terminal-gateway ucl-sam ucl-probe + + + ucl-tg + ucl-cs ucl-niftp + edn-host1 + brl-hep + + + + amsaa + + + + brl-voc + + + + hel-ace + + + + + sri-spam + + wisc-rsch + + wisc-db + + wisc-crys + + + cit-750 + + + uw-beaver + + + uw-lumpy + + + uw-wally Page 12

Address Notes ----------128.9.0.42 128.9.0.43 128.9.0.44 128.9.0.45 128.9.0.46 128.9.0.47 128.9.0.48 128.9.0.49 128.9.0.50 128.9.0.92 128.9.0.93 128.9.0.112 128.9.0.113 128.9.0.114 128.9.0.115 128.9.0.116 128.9.0.117 128.9.0.118 128.9.0.119 128.9.0.121 128.9.0.122 128.9.0.123 128.10.0.2 128.11.0.2 128.11.64.1 128.16.1.67 128.16.1.106 128.16.1.110 128.16.1.112 128.16.1.113 128.16.1.115 128.16.3.2 128.16.9.0 128.16.9.1 128.16.9.2 128.16.9.3 128.16.9.4 128.19.1.1 128.20.1.2 128.20.3.1 128.20.3.2 128.20.3.4 128.21.32.2 192.5.2.1 192.5.2.2 192.5.2.7 192.5.7.3 192.5.8.1 192.5.8.2 b 192.5.8.3


RFC 876 Claim Arpa ISI- VRFY RCPT Bad SMTP net Net Post Post jqkx Host name ----- ---- ---- ---- ---- ---- --------+ + + uw-june + + + uw-eddie + + + + + utah-gr + + + + + utah-sp + nyu-cmcl1 + nyu-acf2 + + + + brl-bmd + + + + brl-vld brl-svg + brl-tgr + + + + brl-vgr + cornell-pvax

Address ------192.5.8.4 192.5.8.6 192.5.12.22 192.5.12.23 192.5.15.5 192.5.15.9 192.5.21.1 192.5.21.2 192.5.21.3 192.5.21.4 192.5.21.6 192.5.36.4

Notes -----

Notes ----a) "VRFY postmaster" gave an unknown user reply; all other negative replies were because VRFY was not implemented. b) No connection could be opened to this host during the test of mailing to nonexistent users

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